Britney's new single, "Womanizer," [1] is available on iTunes today, but we have a little preview clip of what's to come. The video will officially premiere this Friday on 20/20, and as expected [2], it looks like we're going to see a few Britney alter egos in addition to her typical blonde self. Most of you are already loving her new single [3], but are you excited for Britney's new video?